package_utility.vhd
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r110 | --**************************************************************** | ||
--** MODEL : package_utility ** | ||||
--** COMPANY : Cypress Semiconductor ** | ||||
--** REVISION: 1.0 Created new package utility model ** | ||||
--** ** | ||||
--**************************************************************** | ||||
Library ieee,work; | ||||
Use ieee.std_logic_1164.all; | ||||
Use IEEE.Std_Logic_Arith.all; | ||||
Use IEEE.std_logic_TextIO.all; | ||||
--- Use work.package_timing.all; | ||||
Library Std; | ||||
Use STD.TextIO.all; | ||||
Package package_utility is | ||||
FUNCTION convert_string( S: in STRING) RETURN STD_LOGIC_VECTOR; | ||||
FUNCTION CONV_INTEGER1(S : STD_LOGIC_VECTOR) RETURN INTEGER; | ||||
End; -- package package_utility | ||||
Package body package_utility is | ||||
------------------------------------------------------------------------------------------------ | ||||
--Converts string into std_logic_vector | ||||
------------------------------------------------------------------------------------------------ | ||||
FUNCTION convert_string(S: in STRING) RETURN STD_LOGIC_VECTOR IS | ||||
VARIABLE result : STD_LOGIC_VECTOR(S'RANGE); | ||||
BEGIN | ||||
FOR i IN S'RANGE LOOP | ||||
IF S(i) = '0' THEN | ||||
result(i) := '0'; | ||||
ELSIF S(i) = '1' THEN | ||||
result(i) := '1'; | ||||
ELSIF S(i) = 'X' THEN | ||||
result(i) := 'X'; | ||||
ELSE | ||||
result(i) := 'Z'; | ||||
END IF; | ||||
END LOOP; | ||||
RETURN result; | ||||
END convert_string; | ||||
------------------------------------------------------------------------------------------------ | ||||
--Converts std_logic_vector into integer | ||||
------------------------------------------------------------------------------------------------ | ||||
FUNCTION CONV_INTEGER1(S : STD_LOGIC_VECTOR) RETURN INTEGER IS | ||||
VARIABLE result : INTEGER := 0; | ||||
BEGIN | ||||
FOR i IN S'RANGE LOOP | ||||
IF S(i) = '1' THEN | ||||
result := result + (2**i); | ||||
ELSIF S(i) = '0' THEN | ||||
result := result; | ||||
ELSE | ||||
result := 0; | ||||
END IF; | ||||
END LOOP; | ||||
RETURN result; | ||||
END CONV_INTEGER1; | ||||
end package_utility; | ||||